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Because disks are made to operate above freezing, and according to a test by Google IIRC, low temps, like <30C can be as bad for disks as hight temps, >45C, for better reliability disks should operate between those temps.

Just don't shut down the server and let it get cold. Ideally you should build it a little insulated box with temperature controlled ventilation, so the server can keep itself warm, and use the cold outside air to moderate the heat.

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ah ok i did shut server off to replace the cable but i found my cable too short so i just stuck old one back on and made sure she good and tight... i through a coat over it... and i guess i can pull the cooler fans off too..

i also have a Pfsense using a Micro gaming motherboarding and using a 120GB SSD and i have a towel over that so i dont have to clean the dust of it.. but is it safe as it doesnt have no spinning parts

and i guess i can do that set it to never spin down... my hds do have a 5yr warrenty

When a write to a disk fails for whatever reason, Unraid disables the disk. After a disk is disabled, Unraid will not use it again until it is rebuilt. Any further attempts to read/write to that disk are done by emulating the disk from the parity calculation.

If you read from the disk, Unraid doesn't actually attempt to read the disabled disk. Instead, it calculates the data by reading ALL other disks plus parity.

If you write to the disk, Unraid doesn't actually attempt to write to the disabled disk. Instead, it updates parity as it would have if the disk had been written. So, on subsequent reads of the emulated disk, even that data can be calculated.

Even the original failed write was emulated in this way, by updating parity. So the actual contents of the physical disk are no longer valid. But the valid contents are in the rest of the array from the parity calculation and the disk can be rebuilt so it will contain the complete and up-to-date valid contents.

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learn something new everyday... its amazing how it knows how to emulated the data and stuff,,, way over my head..

for now i have it remounting fingers crossed... i got a coat over the intake.. and on weekend ill get another cable and ill unplug the fans

are there any as i wanna get a Rackmount Case but are there any Temperature Sensor PC fan controllers you guys recommend as you mentioned about building a box and a sensor... is there one you guys recommend.. and i have set the hard drives from 15 min spin down to never

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The only way to clear the disabled status (without potential data loss) is to rebuild the disk so that the contents match the emulated disk.

to do this:

Stop the array

set the disbled disk to “Unassigned”

start the array. (you will be warned the array is now unprotect4d)

stop the array

reassign the disabled disk

start the array (you will be told the disk is being rebuilt)

the rebuild process will now start. Expect it to take a long time (roughly the same as a parity check). You can use the array while the disk is being rebuild but any disk I/O will slow down the rebuild process so you may prefer to leave it to complete first.

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learn something new everyday... its amazing how it knows how to emulated the data and stuff,,, way over my head..

Parity isn't really very complicated. It is used in lots of ways in computers and communications. Understanding parity can help you understand many things about how Unraid works and how it makes you use it. Here is a wiki:

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ah ok.. ya my drives are all 7200 rpms i been swaping out as my drives have been failing and i had them sitting mulitple computers now just made good server.. and then practice with a 2nd unriad as my backup of the main server.. well just the important like docs and photos

they used to take longer with my 5400 and 5900 rpms and then on my other server i using just SATA 1 speed as that computer was 11 yrs old or so